Commit | Line | Data |
---|---|---|
9552f73f | 1 | //CFLAGS=-lasound make beatdetect; echo -----; ./beatdetect hw:default |
3f407b74 H |
2 | //http://www.equalarea.com/paul/alsa-audio.html |
3 | ||
9552f73f H |
4 | #include <stdio.h> |
5 | #include <stdlib.h> | |
6 | #include <alsa/asoundlib.h> | |
7 | ||
8 | main (int argc, char *argv[]) | |
9 | { | |
10 | int i; | |
11 | int err; | |
12 | short buf[128]; | |
13 | snd_pcm_t *capture_handle; | |
14 | snd_pcm_hw_params_t *hw_params; | |
15 | ||
16 | if ((err = snd_pcm_open (&capture_handle, argv[1], SND_PCM_STREAM_CAPTURE, 0)) < 0) { | |
17 | fprintf (stderr, "cannot open audio device %s (%s)\n", | |
18 | argv[1], | |
19 | snd_strerror (err)); | |
20 | exit (1); | |
21 | } | |
22 | if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0) { | |
23 | fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n", | |
24 | snd_strerror (err)); | |
25 | exit (1); | |
26 | } | |
27 | ||
28 | if ((err = snd_pcm_hw_params_any (capture_handle, hw_params)) < 0) { | |
29 | fprintf (stderr, "cannot initialize hardware parameter structure (%s)\n", | |
30 | snd_strerror (err)); | |
31 | exit (1); | |
32 | } | |
33 | ||
34 | if ((err = snd_pcm_hw_params_set_access (capture_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) { | |
35 | fprintf (stderr, "cannot set access type (%s)\n", | |
36 | snd_strerror (err)); | |
37 | exit (1); | |
38 | } | |
39 | ||
40 | if ((err = snd_pcm_hw_params_set_format (capture_handle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) { //SND_PCM_FORMAT_S16_LE | |
41 | fprintf (stderr, "cannot set sample format (%s)\n", | |
42 | snd_strerror (err)); | |
43 | exit (1); | |
44 | } | |
45 | ||
46 | /* puts("lolopre"); | |
47 | if ((err = snd_pcm_hw_params_set_rate_near (capture_handle, hw_params, 44100, 0)) < 0) { | |
48 | puts("loloerr"); | |
49 | fprintf (stderr, "cannot set sample rate (%s)\n", | |
50 | snd_strerror (err)); | |
51 | exit (1); | |
52 | } | |
53 | ||
54 | if ((err = snd_pcm_hw_params_set_channels (capture_handle, hw_params, 2)) < 0) { | |
55 | fprintf (stderr, "cannot set channel count (%s)\n", | |
56 | snd_strerror (err)); | |
57 | exit (1); | |
58 | } | |
59 | */ | |
60 | ||
61 | if ((err = snd_pcm_hw_params (capture_handle, hw_params)) < 0) { | |
62 | fprintf (stderr, "cannot set parameters (%s)\n", | |
63 | snd_strerror (err)); | |
64 | exit (1); | |
65 | } | |
66 | ||
67 | snd_pcm_hw_params_free (hw_params); | |
68 | ||
69 | if ((err = snd_pcm_prepare (capture_handle)) < 0) { | |
70 | fprintf (stderr, "cannot prepare audio interface for use (%s)\n", | |
71 | snd_strerror (err)); | |
72 | exit (1); | |
73 | } | |
74 | ||
75 | //for (i = 0; i < 10; ++i) { | |
76 | for (i = 0; 1; ++i) { | |
77 | if ((err = snd_pcm_readi (capture_handle, buf, 128)) != 128) { | |
78 | fprintf (stderr, "read from audio interface failed (%s)\n", snd_strerror (err)); | |
79 | exit (1); | |
80 | } else { | |
81 | int j; | |
82 | for(j=0;j<128;j++) if((int)buf[j] > 1000) { | |
5ff11565 H |
83 | //printf("BOOM! %d\n", (int)buf[j]); |
84 | //puts(""); | |
85 | putchar('!'); | |
86 | fflush(stdout); | |
9552f73f H |
87 | break; |
88 | } | |
89 | } | |
90 | } | |
91 | ||
92 | snd_pcm_close (capture_handle); | |
93 | exit (0); | |
94 | } |